Hot weather might arrive just as students head back to school, but don't worry, a polar vortex might be right behind it, according to AccuWeather.com.

And it just might be accompanied by another mini baby boom, experts say.

While temperatures have remained on the cooler side so far this summer, 90-degree temperatures could be coming in late August to early September, said Mark Taquette, a meteorologist with AccuWeather.com. There could even be a heat wave.

But another cold shot of air could be coming in mid- to late-September, ushering in cooler than normal temperatures. The daytime highs could be in the upper 50s to 60s. The nighttime lows could dip into the 40s or 30s, he said.

"We expect the general pattern from summer to continue ... right through the fall," Taquette said.

The polar vortex is a scientific term. It is a phenomenon in the upper atmosphere over the pole that migrates south and brings bitter cold air. The effect, though, in September will be minor compared to the bitter cold from last winter.

"It's really overblown," he said of the term. "It's like Sharknado."

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Meanwhile, some Pittsburgh hospitals are preparing for a baby boomlet of aptly named "polar vortex babies" due to be born in August and late September, according to the Associated Press.

"With the polar vortex, people were staying in; it was too cold to go anywhere or do anything, so you stay in and keep yourselves busy. It's hibernation, and it's partly entertainment," said David Logan, an obstetrician/gynecologist with the Allegheny Health Network and director of obstetrics at Jefferson Regional Medical Center, Jefferson Hills. "If you can't get out, maybe you can't go get the form of contraception you normally use."

West Penn and Forbes Regional hospitals, which together average 3,500 births annually, are experiencing respective increases of 27.8 percent and 15.9 greater than their average number of deliveries each summer, the Associated Press reported. The surge is partly due to the anticipated influx of "polar vortex" births, doctors said.

It wasn't clear on Thursday if York County might see an uptick in births in late summer and early fall because of the cold, snowy winter. York and Memorial hospitals were checking into it, and staff at a couple of doctor's offices said they were not sure of the numbers.

Still, jumps in birth rates have been historically linked to conditions that drive people indoors. "A textbook example is the New York blackouts," Logan said. "People wanted to stay inside at night, be close with their partners, and nine months later there was a spike in birth rate."

Micro spikes in birth rates can even occur after a regular winter, Logan said. "People aren't in the mood to do anything but be together inside."

So what's the outlook for this upcoming winter?

A weak El Nino is expected, Taquette said. That means a combination of moisture and cold air for the area.